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First step: flash the ethernet sketch (program) into the Arduino. Click here to get it. With a Pro Micro board, simply use the built-in USB port for this. But here, we are using Pro Mini boards, so an external 5V TTL serial adapter is used.

Normally, the Arduino would have the six-pin header (shown) soldered in place, but we don't want that here (it gets in the way).
First step: flash the ethernet sketch (program) into the Arduino. Click here to get it. With a Pro Micro board, simply use the built-in USB port for this. But here, we are using Pro Mini boards, so an external 5V TTL serial adapter is used.Normally, the Arduino would have the six-pin header (shown) soldered in place, but we don't want that here (it gets in the way). (z040123817)
z040123817 (2/31): OnePlus-LE2125 ISO250 1/120 f1.9 6.064mm 2022-02-04 12:38
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